#define _CRT_SECURE_NO_WARNINGS 1
class Solution {
public:
    vector<vector<string>> groupAnagrams(vector<string>& strs) {
        unordered_map<string, vector<string>> hash;
        for (auto& s : strs)
        {
            string t = s;
            sort(t.begin(), t.end());
            hash[t].push_back(s);
        }

        vector<vector<string>> ret;
        for (auto& [x, y] : hash)
        {
            ret.push_back(y);
        }
        return ret;
    }
};